Well that will work, provided you put the inlet *higher* than the outlet (in your case, on the side) so you won't recirculate bubbles...
BTW I've built my aitrap with:
1 elbow (at bottom)
1 straight plug (on the side)
1 40mm pvc pipe (length: 50mm)
2 pvc end caps (the bottom one has a hole through which i put the elbow)
total cost: less than $5 (not counting PVC glue which i had for other reasons).
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